PHP开发过程中常用函数收藏

1.打印数组函数

function _print($array)
{
echo ("<pre>");
print_r($array);
echo ("</pre>");
}

2.截取字串

func_chgtitle
function func_chgtitle($str,$len)
{
if(strlen($str)>$len)
{
$tmpstr = "";
$strlen = $len;
for($i = 0; $i < $strlen; $i++)
{
if(ord(substr($str, $i, 1)) > 0xa0)
{
$tmpstr .= substr($str, $i, 2);
$i++;
}
else
$tmpstr .= substr($str, $i, 1);
}
return $tmpstr."";
}
else
{
return $str;
}
}

3.加载文件

loadfile
function loadfile($filepath)
{
$filecontent = "";
$fptr = fopen($filepath,"r");
if ($fptr)
{
while ($content = fgets($fptr,4096))
{
$filecontent .= $content;
}
fclose($fptr);
}
return $filecontent;
}

4.下载文件
downloadfile

function downloadfile($path,$fileinfo)
{
$target_file = $path.$fileinfo['fileid'];
$file_content = loadfile($target_file);
header("content-disposition: attachment; filename=".$fileinfo['filename']);
header("content-type: ".$fileinfo['filetype']);
header("content-length: ".$fileinfo['filesize']);
echo $file_content;
}

5.数组排序

/**
* @package bugfree
* @version $id: functionsmain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss exp $
*
*
* sort an two-dimension array by some level two items use array_multisort() function.
*
* syssortarray($array,"key1","sort_asc","sort_retular","key2"……)
* @author chunsheng wang <[e-mail]>
* @param array $arraydata the array to sort.
* @param string $keyname1 the first item to sort by.
* @param string $sortorder1 the order to sort by("sort_asc"|"sort_desc")
* @param string $sorttype1 the sort type("sort_regular"|"sort_numeric"|"sort_string")
* @return array sorted array.
*/
function syssortarray($arraydata,$keyname1,$sortorder1 = "sort_asc",$sorttype1 = "sort_regular")
{
if(!is_array($arraydata))
{
return $arraydata;
}
// get args number.
$argcount = func_num_args();
// get keys to sort by and put them to sortrule array.
for($i = 1;$i < $argcount;$i ++)
{
$arg = func_get_arg($i);
if(!eregi("sort",$arg))
{
$keynamelist[] = $arg;
$sortrule[] = '$'.$arg;
}
else
{
$sortrule[] = $arg;
}
}
// get the values according to the keys and put them to array.
foreach($arraydata as $key => $info)
{
foreach($keynamelist as $keyname)
{
${$keyname}[$key] = $info[$keyname];
}
}
// create the eval string and eval it.
if(count($arraydata)>0)
{
$evalstring = 'array_multisort('.join(",",$sortrule).',$arraydata);';
eval ($evalstring);
}
return $arraydata;
}

来源：